T. R. Karl

American climatologist

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lilac bud break, humidity, and temperatureGraph of atmospheric vapour pressure and expected minimum temperature for 56 days prior to and following the average day of the leafing out of lilac plants, based on data compiled by M.D. Schwartz and T.R. Karl, 1990. Encyclopædia Britannica, Inc.

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study of climate, life, and temperature interaction

Schwartz and T.R. Karl used the superimposed epoch method to study the climate before and after the leafing out of lilac plants in the spring in the U.S. Midwest. (This method uses time series data from multiple locations, which can be compared to one another by adjusting…